Vacuum-wall hot-water tank.



G. c. H. MUPHBBTBRS. VACUUM WALL HOT WATER TANK.

APPLICATION FILED JAH. 20, 1910.

` Patented Sept. 13, 1910.

GEORGE C. H. MCPHEETERS, OF PALO ALTO, CALIFORNIA.

VACUUlVI-VJ'ALL HOTWATER TANK.

Specification of Letters Patent.

`Patented sepais, 1910.

Application filed January 20, 1910. Serial No. 539,089.

To all 'whom it may concern:

Be it known that I, (iconen C. II. Mo- Pnnirrnas, a citizen ot the'United States, residing at Palo Alto, in the county of Santa Clara,4State ot California, have invented certain new and useful Improvementsin Vacuum-vali Ilot-later Tanks; and I do hereby declare the iollt'iwinrto bc a t'ull, clear, and exact description oit' the'invent ion, such aswill enable others skilled in the art to which it appertains to make anduse the same.

This invention relates to what are cornmonly known as kitchen boilersand has special reference. to providing a boiler ot' this descriptionwith a vacuum jacket to enable the heat to be retained in the boiler,the 'vacuum acting,Y in the ordinary manner to insulate the boiler fromthe outside atmosphere.

Une objectoi the invention is the provision of moans adapted to hold areceptacle within a casingv and in .spaced relation thereto, the means attor-ding; ironmninieation for inlet and outlet pipes to the receptacle.

Another object of the invention is the provision of spacing' means ofthis character which will also act to retain inlet and outlet pipes intheir proper positions.

lVith the above and other objects in view, the invention consists ingeneral of an inner receptacle` an outer casing in spaced relationthereto, and novel spacers holding,` said inner receptacle and thecasingl in spaced relation, said spacers being ladapted to atl'ordconimunication between the receptacle and the exterior of the casing'.

The invention further consists in certain novel details otl constructionand combinations of parts hereinafter fully described, illustrated inthe accompanying drawings, and specifically set forth. in the claims.

In the accompanying drawings, like characters of reference indicate likeparts in the several views, and Figure 1 is a sectional view takenthrough the preferred form of boiler constructed in accordance with thisinvention. Fig. 2 is a partial sectional view of a modified itorm of theboiler. Fig. 3 is an enlarged detail section through one of the spacers.Fig. 4t is detail perspectives ot' the spacers with the parts separated.

The numeral 10 indicates the inner receptacle and thenumeral 11 thecasing therefor. This inner receptacle and its casing are held in spacedrelation b v means of certain novel spacers. In order to afford entranceto the inner receptacle this receptacle is provided with a. plurality ofapertures y12 and the casing is also provided with threaded apertures 13arranged in opposed relation to the apertures 12. Surrounding each ofthe apertures 12 is a flange 14. having a threaded opening 15 formedcentrally thereoit' and this flange is securely attached to the outsideof the receptacle by means of rivets 1G. At 17 is a thimble providedwith threaded ends one of which is screwedinto the threaded opening inthe flange 14. Screwed into each of the openings 13 is a sleeve 1Shaving external threads 19 to engage the threads of the opening whereinthe sleeve is screwed and this sleeve is further provided with aninternally threaded recess 20 which engages onto the other threaded endof lthe thirnble 17 The sleeve 18 preferably is :formed with a wrenchreceiving head 2l for the purpose ot' screwing it into place. Thethimhle 17 is provided with internal threads throughout its length forthe purpose of engaging the external threads `formed on the ends ofcertain pipe nipples.'

These pipe. nipples are arranged so that at 22 is an inlet pipe for thecold water, at 23 is au outletor draw-off pipe for the receptacle, atllt is a hot water inlet )ipe and at 25 is a hot water outlet pipe. Thepipes 23 and 9.4 a re connected in the usual manner, not deemednecessary here to be shown, to any form of heater such as a stovewater-back, instantaneous heater, or the like. The casingl 11 isprovided with a suitable opening to receive a valved nipple 26 by meansvof which the space between the casing and the receptacle may beconnected to a vacuum pump.

In the form of the invention shown in Fig. 2 the general construction isthe same as that just described with the exception that the tw heads arebulged outward and that the spacers are arranged radially of thespherical surfaces thus formed.

By means of this construction it will be observed that the pipes whichcommunicate with the receptacle extend through the tubular spacers andthese spacers do not permit the entry of air from outslde the easing orthe entry of water or steam from the receptacle to the space between thereceptacle and casing. When the device has been set up the valved nipple26 is connected to a vacuum pump and the air exhausted from between thereceptacle and casing. The valve is then cut oil and the pump detached,the outer end of the nipple being, if desired, suitably seal-ed by aplug or cap. lt `will be obvious from the foregoing that only the Smallarea .of the pipes and spacers will aord conductors for ,the heat Withinthe ,receptacle so :that when the Water contained therein is once heatedit will remain in this condition for a relatively long period of time.It Will, furthermore, 0e-obvious that in the process of heating' up thisWater practically no heat will be Wasted and the process will thus begreatly hastened. There has thus been provided a simple and efficientdevice of the kind described and for the purpose specified.

lt is obvious that minor changes may be made in the form andconstruction ot' this invention Wit-hout departing from the materialprinciples thereof. It is not therefore desired to confine the invention'to the exactform herein shown and described, but 'it is wished toinclude allsuchas properly come Within the scope of the appended claims.

Having thus described the invention, what is claimed as new, is te l. lna device of the kind described, au inner receptacle, an outer easingentirely surrounding the inner receptacle and spaced trs/enea therefrom,and means to hold the casing in spaced relation to the receptacle, saidmeans comprising,- a plurality of tubular spacers secured to the innerreceptacle and to the casing to prevent access of air or the contents ofthe receptacle to the space between the casing and receptacle, and inletand out-- let pipes leading through and secured Within the spacers.

Q. The combination with an inner receptacle provided with a plurality ofapertures,

. and an outer casing spaced from the receptaclc and having threadedapertures opposed to the apertures in the receptacle; of a plurality ofspacers holding said receptacle and casing in fixed spaced relation,each spacer comprising a flange secured to the receptacle around one ofthe. aperturesy and provided with a centrally disposed threaded oiening,

a thilnblc having threaded ends one or which l is engaged in the openingof said flange, and a threaded sleeve screwed into the aperture of thecasing and onto the other end of said thimble. f

'n testimony whereof, l ailix my signa tur/e, in presence of two.Witnesses.

" GEORGE C. l-L MCPHEEFIERS. A"Witnceses r.

EDWARD J. MCGOVERN, F. SCHNEIDER.

